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referer 가 sir.kr/bbs/register_form.php 인 로그가 계속 쌓이는 이유가 뭘까요?

웹서버 로그파일에 아래와 같은 로그가 지속적으로 계속 쌓이고 있는데,

이유가 뭘까요?

웹서버는 아파치이며,

그누보드 버전은 4 마지막 버전입니다. 

Copy
218.55.74.162 - - [26/Feb/2019:18:42:31 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:32 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174149899 HTTP/1.1" 200 4882 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:33 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:33 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174151179 HTTP/1.1" 200 5305 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:34 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:34 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174152614 HTTP/1.1" 200 5056 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:35 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:35 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174153628 HTTP/1.1" 200 5718 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:37 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:37 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174154907 HTTP/1.1" 200 4923 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:37 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:38 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174156186 HTTP/1.1" 200 5124 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:39 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:40 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174157777 HTTP/1.1" 200 4333 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:40 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:41 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174159010 HTTP/1.1" 200 4617 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:41 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:42 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174160164 HTTP/1.1" 200 5313 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
218.55.74.162 - - [26/Feb/2019:18:42:43 +0900] "POST /gnu/bbs/kcaptcha_session.php HTTP/1.1" 200 - "-" "-"
218.55.74.162 - - [26/Feb/2019:18:42:44 +0900] "GET /gnu/bbs/kcaptcha_image.php?t=1551174162021 HTTP/1.1" 200 4807 "http://www.sir.kr/bbs/register_form.php" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36"
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차단하니, IP 를 바꿔가면서 계속 들어오네요. ㅠㅠ

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